Telegraph system.



Slow

J. H. BELL.'

TELEGRAPH SYSTEM. 3 APPUCATION FIL-ED NOV. 24,@9151' 1,199,339. 'Patemedsepu 26, 1916.

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' 4) y y J4 Siow Release SM rain J''HN H. BELL, OFKEAST ORANG., NEW JERSEY ASSIGNOB T0 WESTERN ELECTRIC COMPANY, INCORPORATED, 0F NEW' YORK, N. Y.; A CORPORATION OF NEW YORK.:

TEL'EGRAPH SYSTEM.

Specification of Letters Patent.

Application filed November 24. 1915. Serial No. 63,251.

To all 107mm 'it may concern:

Bel it known that I, JOHN H. BELL, a subject of the King of Great Britain, residing at East Orange. in the county of Essex and State of New Jersey, have invented certain new and useful Improve- 'ments in Telegraph Systems,V of which the following is a full, clear, concise, and exact description.

rlhis invention relates to telegraph systems ot the double-current type, and its principal object is to provide an arrangement whereby a receiving operator may signal or break a transmitting operator at any time during the sending of messages. lVith the telegraph systems ot this type at present in vogue, it is necessary for the receiving operatorto wait until a, sending operator has finished a message and throws his key switch to receiving position or, as in some other systems, especially with repeaters, to wait for the pause in the transmission of signals to allow the restoration of the repeater apparatus before he can signal the sending operator. It may readily be that such a pauseniay not occur after each word, and the greater the number ot' words before a break can be made, the less easily can mistakes or uncertainties in sending or receiving be remedied. By the application ot this invention, however, the receiving operator can cbreak at any time either on continuous or repeater lines. so that notifica,- tion can be sent to the sending operator as soon as incorrect, indistinct or questionable signals begin to arrive.

To this end the invention contemplates an ar angement whereby a signal at the transmitting station, adapted to operate according to the impulses transmitted, may be affected from a distant station, thus notifying the sending operator that a .receiving operator wishes to ilse the line. The receiving apparatus at the transmitting station lmay also be affected so that the operator may loe given a double notification that the receiving operator is-breaking7 The above and. other objects ofthis invention will be fully set t'orth in the following description and claims, and will be mene 'readily understood hy i'et'erenceto the ai.; con'ipanying drawing, whereine- Figure 1 shows diagi'aminatically the in" vention applied to a terminal station, Fig. 2

' back contact is a diagram of eonnectionsot' a single reLl peater arranged in accordance with the in-` vention, and F ig. 3 is a diagram of the connections oi' a forked repeater system'.

In the so-called terminal stations ofthe transmission line, the character of the cure rent impulses imparted thereto is governed by a transmitting relay 10, whose armature 11 is adapted to engageback and t'rontcon-y tacts connected respectively to the negative and positive terminals of a suitable source' of energy, as indicated in Fig. 1. The yincoming-impulses trom the line normally pass through the windings of a polarized whose armature 1B is connected tol a grounded source of energy 14. Armature* 13 cooperates with a contact connected t'o'4 relay 1Q.,

the winding ot' a receiving signal, suchas a grounded sounder 15. There is also 'provided the usual telegraph key 1G and a send-` ing signal or sounder 17 located in a circuit" connected to one terminal oi the winding of transmitting. relay 10. sounders .15 and 17 and key 16 may be located at a subscribers station removed some distance troni the terminal station instead ot atthe terminal of a line section.

of a relay Q0, the other terminal of which is c nnected to an armature il ot' a breakl' winding ot' relay to an armature 24v' oi` relay 20, this armaturel cooperating with a connected to the winding ot' relay 12 and completed from ground through sounder 17, relays 10 and Q0, armature 2l and back con-v tact of relay 22 to grounded source 23,'v and 20 attract their whereupon relays 10 aru'iatures. Armature 24 ot relay 2O connccts armature li tothe line through"ther key 16, so that the proper combinations ot positive and negative currents are transmit-` ted to the line to Jorm the desired signals.L .Relay 20, on the other hand, is a slow-ref desired,

TheT other terminal ot the winding ot' `relay 10- is connected to a terminal otf the windingf Patented Sept. .26, 19916.y v.

a front contact connected 'to armature 11. It will be apparent, therefore, that whenever key 1G is closed, a circuitis-r mature 21.

lease'relay, attracting its armature readily upon the First passage of current through its winding, but thereafter not allowing its armature to become separated from its coperating front contact during the comparatively short intervals between the signals .making up the letters of a word.' It may also readily be that in the case of rapid sending. relay 2O will not allow its armature to fall back even during the intervals be-y tween words. Relay 22 is: so constructed and adjusted that its armature 21 1s not moved from engagement with.` its back con? tact by the normal strength of the signal ing currents supplied through armature 11. lr" two stations, similar to the terminal station shown in Fig. 1, are connected to the opposite ends of the transmission line without interveningrepeaters, it will be ap.n parent from the foregoing description that the closure of the sending key, correspond` ing to key 16, at the distant station (for convenience referred to as the receiving station) will. there energize relays correspondn ing to transmitting relay 10 and slow release relay 20, whereupon positive current will be impressed upon the line from, that station. it now, the key 16 is depressed, the relays 10 and 2O will lbe energized to move their respective, armatures against their forward Contact stops as already described, thereby disconnecting the receiving relay 12 and connecting the line relay 22 to the grounded source of positive current.

r'llhen this condition occurs there will be times during the transmission of impulses at the sending station, when armature 1]. at that station is against its back contact, and thereby connected to the grounded source of negative current. Therefore, since the two remote sources of grounded current, supply will then .be connected in series aiding, there Will be a suicient lowv extends theline through polarized relay 12,

and if the key of the.breaking operator is still depressed, armature 13 Will cause the action of sounder 15, so that the send-v ing operator will be notified that the rel ceiving operator` Wishes the use of the line not only by the mutilation of the signals ofhis sending sounder, but by the intermittent operation of the receiving sounder. The subsequent retraction of, armature 24 caused by the opening of the circuit through relay 20 also 'disassocfrates armature ll with the line, resulting in a decrease in v the terminal stations, the connections are if made according to Fig. 2. Line section l passes through the winding of a break `relay 30 to an armature 3l of a slowrelease relay 32, and from thence normally through the winding of a slow-release relay 33 to the winding of a polarized relay 3l. The other terminal. of the winding of relay 3l is normally grounded through an armature 35 and a coperating back contact vot a break relay 36. In a similar manner, line section 2 passes through the winding of break relay 36 to an armature l0 of slow-release relay 33, and from thence normally 'through a cooperating back contact of relay 33 through the winding ot' slowrelease relay 32 to onev terminal oi' the winding of a polarized relay 41. The other terminal of polarized relay 41 is normally grounded through an armature 42 and a coperating back contact of fbreak relay 30. Relay34 is provided with an armature y45 connected to a front contact cooperating with armature 40 of relay 33, and is 'adapted to engage right-hand and left-hand contacts respectively connected to the posi1 tive and negative poles of a suitable source of energy 46. r)The "positive pole of source 4G is also connected to a front contact cop- @rating with armature 35 lot break relay 36. Similarly, relay 41 is provided with an armature 47 connected to a front cont-act lcooperating with armature 31 of relay 32 and adapted to engage right-hand and lefthand contacts respectively connected to the positive and negative poles of a source of energy 48. The positive pole of the source 48 is also-connected to a front Contact codo, erating with armature 42 ol' relay 30.

Signals, whose characters are determined by the positions of armature 11 of relay 1() of a terminal station arriving at the repeater over line section l, pass through the ,winding of break relay 30, armature 31 and back Contact of relay 32, through the windingso relay 33 and 34 and armature 35 and itsg'coperating back contact of relay to ground. Relays 33 and 34 attract their armatures, armature 40, associating armature 45 with line section 2, through the winding of break relay 36; and armature 45 causing positive current from source 4G ,to flow over this circuit to a distant. station preferably also arranged like Fig. l, on lin`e` section 2. This current at the distant re ceiving station then passes through relays similar to break relay 22 and ,polarized relay 12, causing the proper action of a re-v lWhile slo '-release relay 33v does not allow its armature ll to become disengaged from its front contact during the reversals or low magnetic intervals betweenithe impulses of a combination.' Break relays 30 and 36 are so `constructed that'currents of normal strength. as supplied by a single. terminal station, do not cause them to attract their armatures. lf, now, the receiving operator wishes to break the sendingoperator, he depresses his sending key, causingpositive current to he applied to the distant end of line section Thereafter, as relay 34, characteristically following the incoming impulses from line section 1, connects armature with the negative pole of source 46, this source is connected in series aiding to the source cooperating with armature 11, and an increased liow of current passes Vthrough the winding of c"break relay 36.

This relay thereupon attracts its armature completing a circuit from positive pole of source o, through armature 35, windings v nl.; m si y 1r L, t. 1 H1 ci it aye f and oe, act contac anc ai a turc 31 of relay 32,.tlie winding of break relay over line section 1 winding of" hrealr' relay armature 24 and front contact or' relay7 20, through armature 11 to the negative pole of the source of energy at the sending terminal station. There is therefore, an increased flow of current through the windings of relays 30 and 22 which attract their armatures. The attraction of armature 42 of relay 30 performs no function at this time, but the attraction of armature 21 of relay 22 breaks the local sending circuit as hereinhefore described, resulting in the mutilation of the signals indicated by the sending sounder.

if the line conditions are such that relay is energized for a sufficient period of time to open the circuitof slo\vielease relay 20 long enoughv for its armature 24 to fall back aga' ist its hack contact, a circuit is completed through polarized relay '12 and the receiving signal or sounder will operate, giving a double indication that the distant operator has broken and Wishes to use the line. y

ln case the distant operator is transmitting, the incoming impulses over line section 2 arc repeated to line section l through the instrumentality of relays 32 and 41, and the' operator at the terminal of line section 1 may break hy depressing his key 16, which results inan increased flow of current through line section 2 because of the pulling up of break relay 30 in the `following manner: The attraction of armature 622 of. relay 30 connects the positive pole of source 48 to line section 2 through the windings of relays 11 and.v 32, the back conta ct and armature 40 of relay and the winding of relay 3G. Thereafter, when the negative pole of source of current at the distant station transmitting impulses over line section 2 is connected to this section by the opening ofthe sending key, the increased flow of current resulting therefrom will cause the energization of the break relay 22 at the terminal station on line section 2, resulting in the mutilation of the signals of the sending sounder and pro'- ducing intermittent signals on the receiving sounder, as hereinbefore explained in connection With F ig. 1. l

In the forked repeater shown in Fig. 3, line section 1 is associated with a slow-re lease relay 50 having a pair of armatures 51 and 52, a break relay 53 provided with an Yari'nature 5l and a polarized relay equipped with an armature 5G. 56 is connected to one terminal of the winding of relay 53 and cooperates with right- 'hand and left-hand contacts connected respectively to the positive and negative poles of a source of energy 57. Line section 2 is associated with a slow-release relay (50 having armatures 61 and G2, a break relay (33 having an armature G4 and a polarized relay G5 provided with an armature (S6. Armature G6 is connected to one terminal of the winding of relay 63 and is adapted to engage right-hand and left-hand contacts rcspectively connected to the positive and negative terminals of the source of energy G7. ln a like manner line section 3 is as sociated with a slow-release relay 70 having armatures 71 and 72, a break relay 73 having an armature 74, and a polarized rclay 75 provided with an armature 76 being connected to relay 73 and cooperating with contacts connected to lsource 77. The impulses arriving over line section 1 pass through armature 72 and hack contact of relay 70, armature (3l and hack contact of relay through the windings of relays and to ground at armature 54 of relay Relays 5() and 55 attract their armatures, armature 51 connecting armature 5G to line section 2 through the winding of relay 53 and the hack contact and arniature 7l of relay 70, and armature connecting armature 56 to lino section 3 through the winding of relay and the hack contact and armature (l2 of relay G0. Armature 5G engaging its right-haiul cooperating contact, therefore, connects the positive pole of source 57 to line sections 2 and 3. Subsequent impulses arriving over line section 1 are followed by polarized relay 55, which imparts to line sections 2 and 3 positive and negative currents corresponding to the'impulses-received over line section 1.

When the distant operator on either line Armature v lll@ sections 2 or 3 desires to break the seniling operator on line section lj a source oit .the positive pole of source 57 to line section l over a path through the windings oi relays 55 and 5U, hack contact enel armature lil otrelny il()r and the hack Contact z nl armature. 'T2 of relay 70. lVhen the inaniprr lation, of the sending key at' the terrninel station on line section l connects the source of sending current in series aiding; with source 57, there is :in increased llow of i rent through the winding ol' the break relay at that terminal station, which mutilates the signals of the sending sounder anal causes intermittent operations of the receiving:r souinler` as previmisly clescribecl. in a similar manner, impulses arriving over line section 2 are repeated to line sections l and El, and the sending operator on section may be lil-eicell" by the. receiving operators ut the terminal stations on either ot' the other sections, and impulses arrii'inc)v over line section 2l may he repeated to line sect-ions l and 2, and the sending operator on sectioii 3 may he hroln by the receiving operators on sections l and 'lil'lhat is elaiinefl is:

l. ln a telegraph system, a main line circuit anal telegraphie transmitting and receiving; means the `alor, and n line relay nornially inoperative under telegrapllic signals for operatively controlling said transmitting ineens.

In a telegraph systemA`v :i main line circuit :unl a, plurality ot transmitting and receiving equipments therefor, a plurality of line relays unresponsive to telegrapliic sig nal for operatively controlling said trans niitting equipments, "and .means responsive on the simultaneous operation of more thun one ot' said transmitting eipiipments to cause the actuation ol said line relays to interfere with said transmitting equipments.

3. il telegraph system comprising a trans mission line, transmitting means nt one station on salti line to impart signal current impulses thereoier to a distant station. a signal at the transmitting station eon trollecl hy and adapted to operate according to the impulses se transmitted, and a relay also at the transmitting station traversed but unaliectefl hy such current impulses but affected by .increased currents for affecting the ope ation of said signal, and means lo catei'l at a distant station ter increasing the flow of current through sairl relay to eliect its operation.

in witness whereof, l hereunto subscribe my name this 20th day of November, A. D.,

JOHN H. BELL. 

